My fuel pump won't stop running. I jumpered the pump test connector under the hood, then took it out after my troubleshooting. The pump still runs with the key in the on position and the car not running even without the the connector jumpered. Is there something that needs to be done to reset it?

 

just set the pump on a toggle switch, and before you start the car flip the switch. flip it off before you stop the car to keep from flooding.

 

I already have a switch installed, but would rather not have to worry about it. I don't want the pump to run when the car is off and the key is at the on position.

 

do you dont want your car to run either?

the pump runs when the ket is in the "on" position because it has to prime the fuel system to get the car to start. My talon does that, my friends blazer does that. etc.

 

No. Please stop writing that . There is no PRIIME by going to ON. Stop it, please.Your misleading people.

The only thing that comes close to Prime, is when the key is HELD to START. When you do that you energize the Circuit Opening Relay which in turn powers the fuel pump.

Going to ON does NOT make the pump run for even a moment.

 

Two possibilities come to mind. One is that the contacts in the Circuit Opening Relay are stuck together. Number two is the switch in the AFM. When the VANE is all the way fwd, the switch inside the AFM should not be made. If the switch is made with the vane all the way fwd, then something is amiss with the AFM. You can check to see if that switch is made by getting a volt/ohm meter out and checking the contacts on the AFM per the FSM.

That switch in the AFM does the same thing you do with the fuel pump check connector. When it *makes*, it puts a gnd on the Circuit Opening Relay which will pull in IF the key is to ON or better. When you jumper the Fuel pump check connector you just put a gnd on this same circuit.

 

Oh, crap. Thanks. This is probably my problem. When I was doing troubleshooting, I jammed the AFM open a crack with a piece of wood so the fuel wouldn't cut out on me. It is still open. I was thinking the AFM and the jumper were different rather than the same. This makes more sense.

 

No it doesn't. The fuel lines and rails are kept full by the fuel pump check valve and FPR. There is no need to run the pump before starting the engine, which is why the FC doesn't.

 

Even if the fuel lines were drained, it wouldn't affect starting much without "priming" them. I have a fuel cut off switch that I use sometimes when shutting down the car (rev to 3k, turn the switch to off, and wait for it to die). Although I don't exactly drain the lines, I'm assuming it does take a lot of fuel out of them (still enough to start the car momentarily if I don't turn the switch on).

However, there have been times, such as after working on my fuel system, where it basically is drained. I crank it over, flip the switch on for a split second then off (just enough to get fuel in the system) and it will turn over. Once it fires up, I turn the switch on again to have the fuel pump run. So... basically, there's no need to prime the system.

Unless I'm wrong about how much fuel is left in my lines after taking off the fuel hoses in the engine bay. But, I can't see much more than whats left in the underbody hoses/lines.